Crystallite Size Of TiO2 Research Articles

STRUCTURAL AND MAGNETIC PROPERTIES OF α-Fe2O3/TiO2 NANOCOMPOSITE DERIVED FROM LOGAS NATURAL SAND FOR ENVIRONMENTAL APPLICATION

In this study, the iron oxide/titanium dioxide (α-Fe2O3/TiO2) nanocomposites were prepared by ball milling method using Logas natural sand as raw material. The effects of milling time on the structural, magnetic properties, and chemical composition of the sample were investigated using X-ray diffraction (XRD), vibrating sample magnetometer (VSM), and X ray fluorescence (XRF) spectroscopy, respectively. The XRF measurement results found that the samples were composed of α-Fe2O3, TiO2, SiO2, and others. The crystallinity, magnetic, and composition properties of the samples were modified as milling time increases. The XRD patterns revealed that the samples have a hexagonal structure however, the crystalline size decreases with increasing milling time. The average crystallite size of iron oxide (α-Fe2O3), TiO2, and α-Fe2O3/TiO2 calculated based on Scherrer’s formula was found to be 62.42nm, 37.12nm, and 49.77nm, respectively. The magnetic properties of the sample were studied through hysteresis loops measured using VSM to investigate the effect of milling time on the magnetic properties and found that all samples exhibited ferromagnetic behaviour with saturation magnetization (Ms) and remanence magnetization (Mr) increases to 63 and 74 %, respectively as milling time increases to 200h. The coercivity of the samples increases up to 360.10 Oe for the milling time of 100h and then decreases as the milling time increases. These coercivity values are smaller compared to that of pure hematite (α Fe2O3) nanoparticles. The α-Fe2O3/TiO2 nanocomposites with controlled crystallite size and magnetic properties through different milling times may enable them to be used for environmental applications.

Exposing graphene oxide’s function in enhancing dye sensitized solar cell efficiency

This study aims to explore the potential for increasing the efficiency of the Dye sensitized solar cells through the incorporation of graphene oxide into the titanium dioxide matrix. The presence of defects was observed by Raman spectra. The structural properties and crystallite size of TiO2, GO, and GO/TiO2 composite were investigated using X-ray diffraction analysis, whereas the changes in morphology of graphene oxide and GO/TiO2 were assessed by Field Emission Scanning Electron Microscopy. The presence of functional groups were analyzed by Fourier Transform Infrared Spectroscopy. UV-Visible spectroscopy revealed a reduction in optical bandgap from 3.25 eV for TiO2 to 2.89 eV for GO/TiO2 and optical conductivity were observed increasing from 5.49 × 107 S/cm to 1.19 × 108 S/cm. The efficiency of the fabricated DSSCs was determined through I-V measurement, which showed that the addition of 0.2 wt% of graphene oxide in TiO2 significantly increased the short-circuit current from 0.38 milliampere to 0.75 milliampere, fill factor from 0.71 to 0.82, resulting in a substantial efficiency improvement from 3.99% to 9.11%.

Structural, optical, and electrical characteristics of anatase titanium dioxide tailored by doping of nitrogen and copper ions

Pure anatase TiO2 nanoparticles and its mono–doped and co–doped derivatives [i.e. (TiN0.007O1.993); (Ti0.998Cu0.002O2); (Ti0.998Cu0.002N0.007O1.993)] were prepared by sol–gel auto–combustion technique. Further, the effects of copper (Cu) and nitrogen (N) dopants have been investigated on structural, optical and dielectric properties of nanostructured TiO2 using X–ray diffraction (XRD), Raman spectroscopy, ultraviolet–visible (UV–Vis) spectroscopy and dielectric spectroscopy measurement respectively. The Rietveld refinement analysis of XRD data and Raman spectra revealed that all the synthesized samples have pure anatase phase having tetragonal structure with space group of I41/amd. The pure anatase phase of doped samples illustrate the substitution of Cu ions at Ti4+ sites and N ions at O2− sites in the TiO2 host lattice. The crystallite size of TiO2 and its derivatives has been observed in the range of 11–14 nm. The band gap of TiO2 reduced from 3.2 to 1.9 eV with mono–doping and co–doping of the N and Cu in TiO2 lattice as confirmed by UV–Vis spectroscopy. This red–shift might be occur due to the possible formation of N–2p and Cu–3d localized levels (mono–doping case), and the creation of isolated intermediate states (co–doping case). The dielectric spectroscopy was carried out to investigate the electrical properties in details and explained in terms of structural and intrinsic ionic behaviour of different dopants. The detected band gap energies in N/Cu mono–doped and co–doped anatase TiO2 fall within the visible spectrum, rendering them suitable for harnessing solar energy in photocatalysis and photovoltaic applications.

Structural, optical, and electrical characterization of TiO2-doped yttria-stabilized zirconia electrolytes grown by atomic layer deposition

Electrolyte material optimization is crucial for electrochemical energy storage devices. The specific composition and structure have an impact on conductivity and stability, both of which are essential for efficient device performance. The effects of controlled incorporation of TiO2 into a Yttria-Stabilized Zirconia (YSZ) electrolyte using the atomic layer deposition (ALD) technique are investigated in this study. The surface chemical composition analysis reveals variations in the Ti oxidation state and a decrease in the O/(Zr + Y + Ti) ratio as TiO2 concentration increases. The formation of acceptor states near the valence band is proposed to reduce the bandgap with the Fermi level. The structural properties indicate that as TiO2 concentration increases, surface homogeneity and crystallite size increase. The contact angle with water indicates a hydrophobic behavior influenced by surface morphology and potential oxygen vacancies. Finally, electrical properties, measured in Ru/TiO2-doped YSZ/Au capacitors operated at temperatures between 100 and 170 °C, showed that the TiO2 incorporation improved the ionic conductivity, decreased the activation energy for conductivity, and improved the capacitance of the cells. This study highlights the importance of the ALD technique in solid-state electrolyte engineering for specific applications, such as energy storage devices.

Zinc doped TiO2 thin films for ethanol detection

TiO2 and Zn-doped TiO2 thin films were prepared by sol gel spin coating technique on glass substrates and their structural, optical and ethanol sensing properties were studied. The films were crystallized into the anatase TiO2 phase after annealing at 500 °C for 2 h. The crystallite size of TiO2 and Zn-doped TiO2 films were in the range of 4–18 nm. The band gaps were in the range: 3.55–3.65 eV. The surface electrical resistivity TiO2 decreased drastically by 1.36 × 10−4 Ω−1 cm−1 on doping with 2 at% of Zn. The ethanol response of films was measured at room temperature (30 °C) and it is found that Zn doping produces a large enhancement in ethanol response. The sample 1.5 at% Zn-TiO2 shows peak response of 44.18 for 500 ppm ethanol. The response and recovery time improve significantly with Zn doping in TiO2.

APPLICATION OF ACTIVATING INFLUENCES IN OBTAINING TiO2-PILLARED MONTMORILLONITE WITH IMPROVED PHOTOCATALYTIC PROPERTIES

A new approach to the obtaining of a highly efficient photocatalyst - TiO2-pillared montmorillonite – by hydrothermally activated intercalation of mechanically dispersed bentonite matrix with the polyhydroxocomplexes of titanium is proposed. The material was characterized by the X-ray diffractometry, low-temperature nitrogen adsorption-desorption, scanning electron microscopy, energy dispersive microanalysis, and zeta potential measurement. The use of short-term (up to 3 min) mechanical dispersion in a planetary mill significantly increases the capacity of cation exchange during intercalation, and the photocatalysts obtained after annealing at 500 °C are characterized by significantly higher values of specific surface area and total pore volume compared with mechanically untreated and initial montmorillonite. The average size of TiO2 crystallites is about 10 nm and the content of anatase is over 90%. Mechanical activation leads to a significant change in the ζ-potential of montmorillonite particles from a significantly negative value in the source material to almost zero, which is an additional argument for more efficient intercalation. Hydrothermal treatment leads to the appearance of coral-like formations of titania on the surface of montmorillonite, and after mechanical treatment they significantly increase in size. Adsorption and photocatalytic properties were studied in a quartz reactor using the rhodamine B dye as example. Complete photocatalytic destruction of the dye was achieved within about 100 min (initial concentration of 40 mg/l, amount of photocatalyst 1 g/l, UV lamp power 250 W). Adsorption kinetics is described by pseudo-first and pseudo-second order models. The kinetics of photocatalysis is described by the Langmuir-Hinshelwood model. The high photoactivity is explained both by the improvement of textural properties and the appearance of additional photocatalytic centers due to the defective structure of mechanically activated montmorillonite.

Propylene Production via Oxidative Dehydrogenation of Propane with Carbon Dioxide over Composite MxOy-TiO2 Catalysts.

The CO2-assisted oxidative dehydrogenation of propane (ODP) was investigated over titania based composite metal oxides, 10% MxOy-TiO2 (M: Zr, Ce, Ca, Cr, Ga). It was found that the surface basicity of composite metal oxides was significantly higher than that of bare TiO2 and varied in a manner which depended strongly on the nature of the MxOy modifier. The addition of metal oxides on the TiO2 surface resulted in a significant improvement of catalytic performance induced by a synergetic interaction between MxOy and TiO2 support. Propane conversion and propylene yield were strongly influenced by the nature of the metal oxide additive and were found to be superior for the Cr2O3-TiO2 and Ga2O3-TiO2 catalysts characterized by moderate basicity. The reducibility of the latter catalysts was significantly increased, contributing to the improved catalytic performance. This was also the case for the surface acidity of Ga2O3-TiO2 which was found to be higher compared with Cr2O3-TiO2 and TiO2. A general trend was observed whereby catalytic performance increased significantly with decreasing the primary crystallite size of TiO2. DRIFTS studies conducted under reaction conditions showed that the adsorption/activation of CO2 was favored on the surface of composite metal oxides. This may be induced by the improved surface basicity observed with the MxOy addition on the TiO2 surface. The Ga2O3 containing sample exhibited sufficient stability for about 30 h on stream, indicating that it is suitable for the production of propylene through ODP with CO2 reaction.

Prickly Pear Fruit Extract: Capping Agent for the Sol–Gel Synthesis of Discrete Titanium Dioxide Nanoparticles and Sensitizer for Dye-Sensitized Solar Cell

Plant extracts have been utilized as an ecofriendly natural reducing agent for the synthesis of nanomaterials, including metal oxides. Prickly pear (opuntia) fruit extract (PPE) was used as a reducing agent for the sol–gel synthesis of titanium dioxide nanoparticles (TiO2 NPs) and as a sensitizer for the TiO2 NPs photoanode used in dye-sensitized solar cells (DSSCs). Ultraviolet-visible and infrared spectra, X-ray diffraction patterns, and scanning electron microscopic images were confirmed in the formation of semiconducting TiO2 NPs with the predominate size of ~300 nm. The use of PPE rendered discrete TiO2 NPs, whereas the typical synthesis without PPE resulted TiO2 aggregates. TiO2 NPs had a tetragonal crystalline structure, and their grain size was varied with respect to the concentration of PPE. The size of TiO2 crystallites was found to be 20, 19, 15, and 10 nm when the volume percentage of PPE was 0.2, 0.4, 0.6, and 0.8%, respectively. TiO2 NPs obtained using PPE were coated on indium-doped tin oxide substrates and sensitized with natural dye made up of PPE and synthetic dyes, namely rose Bengal (RB) and eosin yellow (EY). The photoanode fabricated with dye-sensitized TiO2 NPs was subjected to current–voltage response studies. The maximum power-conversion efficiency, 1.4%, was recorded for photoanodes sensitized with PPE dye, which is considerably higher than that for RB (1.16%) or EY (0.8%). Overall, the above findings proved that PPE can be used as a potential reducing/capping agent and TiO2 sensitizer for DSSC applications.

Partially Reduced Ni-NiO-TiO2 Photocatalysts for Hydrogen Production from Methanol–Water Solution

The study compares the photocatalytic behavior of TiO2, NiO-TiO2, and Ni-NiO-TiO2 photocatalysts in photocatalytic hydrogen production from methanol–water solution. TiO2 and NiO-TiO2 photocatalysts with theoretical NiO loading of 0.5, 1.0, and 3.0 wt. % of NiO were prepared by the sol–gel method. The Ni-NiO-TiO2 photocatalysts were prepared by partial reduction of NiO-TiO2 in hydrogen at 450 °C. The Ni-NiO-TiO2 photocatalysts showed significantly higher hydrogen production than the NiO-TiO2 photocatalysts. The structural, textural, redox, and optical properties of all of the prepared photocatalysts were studied by using XRD, SEM, N2- adsorption, XPS, H2-TPR, and DRS. Attention is focused on the contribution of Ni loading, the surface composition (Ni2+, the lattice O2− species, and OH groups), the distribution of Ni species (dispersed NiO species, crystalline NiO phase, and the metallic Ni0 species), oxygen vacancies, TiO2 modification, the TiO2 crystallite size, and the specific surface area.

Structural Characterization of V<sub>2</sub>O<sub>5</sub>/TiO<sub>2</sub> Nanocomposites Prepared by Co-Precipitation Method

Powder nanoparticles of vanadium oxide doped with titanium dioxide were successfully prepared by the chemical co-precipitation method. The sample was calcined at temperatures 150, 300, 450, and 600°C. As prepared and heat-treated samples were structurally characterized through X-ray diffraction. The crystal size, cell parameters, R-Factor, and structural properties of mixed nano oxide were investigated. The value of the goodness fit factor, R-Factor, and cell parameters were examined by Rietveld Refinement. XRD study reveals that V2O5 exhibits orthorhombic structure and this orthorhombic phase is fully developed at 600°C. By using XRD data crystallite size of V2O5 was estimated to be 33.98nm and the crystallite size of TiO2 was estimated to be 35.04nm.

Electrical, thermal and antimicrobial properties of synthesized TiO2/rGO nanocomposites

Nanocomposites of reduced graphene oxide (rGO) with titanium dioxide (TiO2) were synthesized and characterized by XRD, SEM and FTIR. XRD spectra established the coexistence of graphene and anatase TiO2 in the samples with the average crystallite size of TiO2 ranging from 27.9 nm to 57.76 nm. SEM images show densely deposited TiO2 nanoparticles onto the graphene sheets. The as-synthesized graphene-TiO2 nanocomposites showed excellent electrical conductivity, which can be regulated by the amount of added TiO2. TGA results establish the stability of these nanocomposites at high temperatures. Further, these nanocomposites showed promising results in antimicrobial activities.

H2O2 Exfoliation of TiO2 for Enhanced Hydrogen Production from Photocatalytic Reforming of Methanol

Hydrogen is considered a future energy carrier for clean and sustainable technology. Photocatalytic reforming of methanol produced hydrogen using water and energy from sunlight. This study reported enhanced activity of TiO2 without metal co-catalyst for hydrogen production following H2O2 exfoliation. TiO2 was transformed into peroxo-titania species on the outer layer of the particles, resulting in surface exfoliation. The exfoliation reduced TiO2 crystallite sizes enhanced the surface hydroxyl group and reduced the band gap to 3.0 eV. Hydrogen production from methanol-water mixtures on the TiO2 after four consecutive exfoliations was measured at 300 µmol, significantly higher than the fresh TiO2 (50 µmol). H2O2 exfoliated TiO2 reduced the pathway for charge migration to the surface. A high concentration of surface hydroxyl group trapped the charge carriers for efficient hydrogen production. Copyright © 2022 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

Light-assisted synthesis of Au/TiO2 nanoparticles for H2 production by photocatalytic water splitting

A series of Au/TiO2 photocatalysts was synthesized via the light assistance through the photo-deposition for H2 production by photocatalytic water splitting using ethanol as the hole scavenger. Effect of solution pH in the range of 3.2–10.0 on the morphology and photocatalytic activity for H2 production of the obtained Au/TiO2 photocatalysts was explored. It was found that all Au/TiO2 photocatalysts prepared in different solution pH exhibited comparable anatase fraction (∼0.84–0.85) and crystallite size of TiO2 (21–22 nm), but showed different quantity of deposited Au nanoparticles (NPs) and other properties, particularly the particle size of the Au NPs. Among all prepared Au/TiO2 photocatalysts, the Au/TiO2 (10.0) photocatalyst exhibited the highest photocatalytic activity for H2 production, owning to its high metallic state and small size of Au NPs. Via this photocatalyst, the maximum H2 production of 296 μmol (∼360 μmol/g⋅h) was gained at 240 min using the 30 vol% ethanol as the hole scavenger at the photocatalyst loading of 1.33 g/L under the UV light intensity of 0.24 mW/cm2 with the quantum efficiency of 61.2% at 254 nm. The loss of the photocatalytic activity of around 20% was observed after the 5th use.

Structural changes of TiO2 as a result of CNTs incorporation

The subject of this research work was to analyze the structural and morphological changes of TiO2 as a result of incorporation of CNTs and interpret the underlying principles for the observed interactions. Hybrid TiO2/CNTs nanostructures were prepared by simplified sol-gel method followed by monitoring the thermally-induced alterations occurring up to 400 ºC. The effects of different type of CNTs (activated MWCNTs and as prepared SWCNTs) as well as the variation of the content of MWCNTs in association with the metal-dopant (Pt or Co) influencing the structural parameters of TiO2 was monitored. Addition of CNTs and metallic phase causes reduction of TiO2 (anatase) crystallite size. The applied instrumental techniques such as XRPD, Raman spectroscopy and thermal (TG, DTA and DTG) analysis points out on achieved interaction between TiO2 and incorporated CNTs. Morphological changes, observed from the SEM micrographs, revealed better inter-locking of the TiO2 matrix with SWCNTs than with MWCNTs. Formation of a more structurally disordered and non-stoichiometric anatase phase seemed to be a preferred choice for the obtained TiO2-CNT-metalic phase nanocomposites for further utilization in sensor-design products.

Efficient Adsorption-Assisted Photocatalysis Degradation of Congo Red through Loading ZIF-8 on KI-Doped TiO2.

Zeolitic imidazolate framework-8 (ZIF-8) was evenly loaded on the surface of TiO2 doped with KI, using a solvent synthesis method, in order to produce a ZIF-8@TiO2 (KI) adsorption photocatalyst with good adsorption and photocatalytic properties. The samples were characterized by XRD, SEM, EDX, XPS, BET and UV-Vis. The photocatalytic efficiency of the material was obtained by photocatalytic tests. The results indicate that the doping with I inhibited the grain growth and reduced the crystallite size of TiO2, reduced the band gap width and improved the utilization rate for light. TiO2 (KI) was a single crystal of anatase titanium dioxide. The combination of ZIF-8 and TiO2 (KI) improved the specific surface area and increased the reaction site. The ZIF-8@TiO2 (KI) for Congo red was investigated to validate its photocatalytic performance. The optimal concentration of Congo red solution was 30 mg/L, and the amount of catalyst was proportional to the degradation efficiency. The degradation efficiency of ZIF-8@TiO2 (5%KI) was 76.42%, after being recycled four times.

Physical properties and DFT calculations of the hybrid organic polymeric nanocomposite thin film [P(An+o-Aph)+Glycine/TiO2/]HNC with 7.42% power conversion efficiency

Copolymer of aniline and ortho aminophenol was prepared by using the oxidative polymerization method with ferric chloride as an oxidizing agent in the occurrence of polyethylene glycol (Mol. Wt. 200) as a soft template. The microporous structure thin films were fabricated from the hybrid material of titanium oxide/copolymer (2-aminophenol and aniline) + glycine [P(An+o-Aph)+Gl/TiO2]HNC via a physical vapor deposition (PVD) method. The effect of the addition of glycine and TiO2 nanoparticles (NPs) on the physical properties of copolymer [P(An+o-Aph)] was discussed in light of the study of the crystallinity and optical properties. The addition of glycine increases the crystallinity of the resulting blend with the copolymer. The average crystallite size of TiO2 is ≈ 25 nm. The interaction between the blend and TiO2 was physical. The copolymer showed an absorbance of 1.18 at the wavelength (λ) 374 nm, which increased to 1.26 at λ= 440 nm after glycine addition, also increased to 1.53 at λ= 486 nm after TiO2 loading. Due to glycine blending and TiO2 addition, significant changes in the absorption index and indirect/direct bandgap of the copolymer have been detected. The materials Studio 7.0 program on TDDFT/DMol3 was used to optimize the molecular structure and perform the frequency calculations for the crystal models and isolated molecules. The DFT-Gaussian09W-vibration values are quite similar to the experimental data either in the structure or in the optical properties. The power conversion efficiency (η) of the blend Au/[P(An+o-Aph)+Gl]B/p-Si/Al heterojunction is 5.30 %, which increased to η=7.42% by loading the [TiO2]NPs to blend. The improvements in optical illuminations properties suggest the use the hybrid nanocomposite films in the polymers solar cell application.

Preparation of TiO<sub>2 </sub>Coatings on Carbon Fibers

Carbon fibers have been TiO2 coated. Previously, the carbon fiber surface has been heat-treated to remove the sizing. The TiO2 layer has been formed on the fiber surface using the sol-gel technique by immersion in a solution. After coating, the samples have been dried at room temperature and annealed at 500 °C in air for 30 minutes. The phase composition of the coating obtained has been studied using X-ray diffraction. X-ray diffraction analysis of the coating and sol has shown that the rutile phase and the average size of TiO2 crystallites grow with an increase in the annealing temperature. The results of studying TiO2 coating antioxidative properties within 500-800 °C are given. Studying the morphology of the TiO2 coating on the fiber surface and the burnout rate (weight change) have shown that the coating exhibits good oxidation resistance up to 600 °C.

Structural, Raman and optical investigations of TiO2 nanoparticles prepared using hexamethylenetetramine

Pure TiO2 and Cu doped TiO2 nanoparticles were prepared by a simple solution approach using hexamethylenetetramine as a chelating agent. The XRD analysis confirmed that the synthesized sample has a hexagonal wurtzite structure. Further, the average crystallite size of pure TiO2 and Cu doped TiO2 estimated from the Debye-Scherrer formula is found to be 10 nm and 9 nm respectively. In the Raman spectrum, the bands for the range 125–635 cm−1 ascertains the anatase crystal structure, while the shift in the position of the principal peak of the doped sample toward higher wavenumber indicates that the dopant may extend some defects and/or surface oxygen vacancies in the doped sample. From the photoluminescence spectrum polychromatic emissions are observed in the range 340–500 nm. The UV-Vis result showed that the absorption edge for Cu doped TiO2 extended to the visible region when compared to the pure TiO2 nanoparticles. The optical band gap of pure and Cu doped TiO2 nanoparticles is also found to be 3.06 eV and 2.92 eV, respectively. The observed reduced band gap can serve as a potential candidate for the degradation of organic pollutants.

Low-density TiO2-glass bubble composite for azophloxine degradation

The glass bubbles were used to support the TiO2 via a sol–gel route to synthesize the low-density TiO2-GB composite materials. The composites could be suspended in the azophloxine solution under gentle stirring to obtain a high degradation efficiency. The anatase TiO2 crystallite size was <10 nm in the composites calcined below 450 °C. The TiO2-GB composites prepared at 350, 450, 650, and 800 °C had the bandgap energies of 3.17, 3.13, 3.15, and 3.24 eV, respectively. The TiO2-GB composite calcined at 800 °C had the strongest photoluminescence intensity, followed by the samples calcined at 350, 650, and 450 °C. The change in calcination temperature could greatly influence the pore volume, surface area, and pore size in the composites. The reaction rate constants were 1.38 × 10−3, 9.78 × 10−3, and 9.08 × 10−3 min−1, calculated for azophloxine degradation on the TiO2-GB composites prepared at 350, 450, and 650 °C. The TiO2-GB composite calcined at 450 °C could produce the greatest hydroxyl radicals during the photocatalytic reaction, followed by the samples calcined at 650, 350, and 800 °C.

MECHANOCHEMICAL SYNTHESIS OF ANATASE-RUTILE PHASES AT BALL MILLING IN DIFFERENT CONDITIONS AND ITS CAUSE AND EFFECT ON A PHOTO-OXIDATION PROCESS / SÍNTESE MECANO-QUÍMICA DE FASES ANATÔMICAS NA MOAGEM DE BOLAS EM DIFERENTES CONDIÇÕES E SUA CAUSA E EFEITO EM UM PROCESSO DE FOTO-OXIDAÇÃO

This study aims to evaluate the effect of the grinding parameters applied to TiO2 comminution, which forms a heterojunction of anatase-rutile phases and reduces markedly the size particle. This material is a well-knowm photocatalyst in environmental issues such as degradation of synthetic dyes, mainly due to the large surface area and oxidative radicals generations ability. The influence of time, rotational speed and the solvent was investigated in the grinding process. Catalysts were prepared by a deposition method and were characterized by XRD, textural analysis (BET area), potential electrophoretic, photoacoustic and Mössbauer spectroscopy. The comminution procedure reduced the size of TiO2 crystallites from 87 nm to 22 nm as well as the surface area and pore diameter. The best photocatalytic activity was for TiO2 comminuted for 10 min and 300 rpm in a dry medium supported on ZSM-5. It was registered that the photoactivity of TiO2 decreased with the transition of anatase to rutile phase and also by the iron oxides insertion during the comminution process. This study has a great technologic contribution because it elucidates primary issues on the particle sizes reduction in the catalysts production, whose function is to have a better metal distribution on the support’s surface.